True, Sentry is a good example of a successful open source business model. GitHub itself is probably the best example of a company that's #winning at open source. They don't give their source away, but they give their service away. But it's pretty well-established that there are business models that can subsidize open source, isn't it?

The interesting thing about Gittip is that there's no strings attached for receivers. We've already got a company advertising itself on the Gittip givers leaderboard (https://workforpie.com/). But there's a decoupling of corporate interests from personal interests on Gittip that I think is worth continuing to explore. Even if Gittip were filled with corporate donors, their contributions would still be anonymous to the receivers. There's no strings attached. To me, that's new and interesting.